After 2 weeks I finally put my ecotec header on my 09aveo hatch. The headerhad top quality, nice beaded welds and inside the collector was smooth with no puddles- a sign that this guy knows his stuff. The header had to be slightly modified at the bottom to fit the flex pipe. My hatch sounds a little louder with a nice deep rumble( although I have a lil exhaust rattle under load at about 3000-3200rpm). The car seems to have gained some good #s in the mid range. I have yet to redline it as its only been on for about 5 miles.
Link to his site: http://www.jaex.co.uk/